I really enjoyed the level! You kept the level really close to the original one but improved the design so it's more than simply jumping over gaps. One of the things I don't like about the level "A Ghostly World" is, that you were able to play the level in ghost and normal version. That's something you solved. But maybe remove the invisible wall and replace it with a visible wall that Tux cannot go back. Nonetheless, you've done a great job!